Ek36835840

Debnathpalit et al Int. Journal of Engineering Research and Applications
ISSN : 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.835-840

RESEARCH ARTICLE

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OPEN ACCESS

Phyto-Sociological Assessment of Vegetation of Durgapur
Government College Campus, Durgapur, West Bengal, India
Mousumi Garai1, Debalina Kar2, Debnath Palit3and Arnab Banerjee4
1& 2

Research scholar of PG Dept. of Conservation Biology, Durgapur Government College, Durgapur-713214
Assistant Professor, Dept. of Botany and Head,PG Dept. of Conservation Biology, Durgapur Government
College, Durgapur-713214
4
Assistant Lecturer in Conservation Biology, PG Dept. of Conservation Biology, Durgapur Government
College, Durgapur-713214
3

ABSTRACT
The aim of the investigation was to analyze phyto-sociological characteristics and diversity pattern of the
vegetation of Durgapur Government College campus, Durgapur, West Bengal, India. The results reflect
dominancy of dicotyledons over monocotyledons in the four studied sites. Site II of college campus shows
higher diversity of species among the three studied sites. Maximum IVI value was recorded by Mangifera indica
(41.11) in site I, Caesalpinea pulcherima (40.39) in site II, Eucalyptus paniculata(62.12) in site III respectively.
Plant diversity was maximum in site II. Therefore, proper management and conservative measures needs to be
implemented for conservation of bioresources in Durgapur Government College campus in Durgapur of West
Bengal, India. Distribution pattern of plant species in all sites were regular.
Keywords: Phytodiversity, Importance value index, Species distribution.
I.
INTRODUCTION
The development of human societies often
has caused an overexploitation of forests and a
decrease in their area. Floristic diversity means
floristic variety of plant forms rich diversity suggests a
great many kinds of plants species and conversely
poor diversity indicates flower types of living species.
On this diversity hinges the future, health and beauty
of the living planet habitat of floristic diversity contain
wild species and genetic variation within, it is useful
in the development of agriculture, medicines and
industry. The present study aims to highlight the
biodiversity of trees of Durgapur Government College
Campus of Durgapur, Burdwan district, West Bengal.
The habitat is of immense value to mankind because
the modern material civilization is entirely based on
the exploitation and utilization of the existing
resources drawn from the environment and created
through human efforts. In mountain areas this is more
pronounced; terrain inaccessibility, climate in
hospitability, soil infertility, and transport availability,
scarcity of basic amenities and facilities make life
nature oriented. The controlling mechanisms of
biodiversity in different ecosystems are mentioned by
the theory of species richness which considers
resource availability and disturbance as factors for
structuring plant communities.
The patterns and role of species richness in
ecosystem function are important in terms of land-use
and climate change concerns (Chapin &Korner 1995;
Reynolds &Tenhunen 1996; Oechelet al. 1997). While
there is still debate on the role of species diversity and
ecosystem function (Hooper &Vitousek 1997; Patrick
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1997), species richness is a frequently measured
ecosystem attributes (Magurran 1988) because it
characterizes the biodiversity of an area at any scale.
Species richness is controlled by a variety of biotic
and abiotic parameters (Rannie 1986; Cornell &
Lawton 1992; Huston 1994; Pollock et al. 1998).
The plant diversity at any site is influenced by species
distribution and abundance patterns. A number of
factors have been shown to affect the distribution and
abundance of plant species, including site conditions,
i.e., moisture and nutrient gradients (Day and Monk
1974, Whittaker and Niering 1975, Marks and
Harcombe 1981, Host and Pregitzer 1992) and canopy
coverage, i.e., light availability (Kull and Zobel l991).
However the investigations concerning different types
of forests or similar forests located in different areas
have given no concrete conclusion for pinpointing the
vegetation effect since site condition are changed and
it is often impossible to separate the cause from the
effect.

II.

MATERIAL AND METHODS

2.1 Study Area
The study was carried out in three sites of
Durgapur Government College campus located near at
Durgapur, (23°30’ N, 87°20’ E). Site I (23°32’39.92”N,
87°19’43.36”E at an elevation of 96.01m); site II
(23°32’36.64”N, 87°19’37.04”E at an elevation of
99.66m); site III (23°32’32.14”N, 87°19’41.86”E at an
elevation of 92.04m). Site I is situated in behind of
P.G. Department of Conservation Biology, site II is
located adjustened area of main building, Geology

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Department and staff quarters and site III situated at
the playground area of the college campus.

Serial
No.
1
2
3
4
5
6
7
8
9
10
11
12
13

3.1 Phytosociology and Species Diversity and
Abundance
The number of species in a particular forest
type varies markedly along the altitudinal range of its
2.2 Quadrat and Phyto-sociological Studies
A total of three sites representing various
growth, which depends on the complex suit of factors
categories of natural forests and plantations were
that characterize the habitat of individual species.
selected for vegetation sampling. At each site 20
Ecological function of the species involves all kinds of
quadrats (1 m x 1 m) were laid to quantify various
processes, which are inevitably associated with some
layers. The size of the quadrat used in this study was
changes over space; composition and structure are
decided based on the species area curve method
affected at species level. The fundamental capability
following Misra (1968). Individuals of shrubs,
of ecosystems to evolve, change and recognize
climbers and tree seedlings were enumerated within
themselves is a prerequisite for the sustainability of
each quadrat. The structure and composition of
viable system (Ashby, 1974). The species in a
vegetation across vegetation types have been
community grow together in a particular environment
compared in terms of frequency, density, abundance,
because they have a similar requirement for existence
and basal area of major species. Importance Value
in terms of environmental factors (TerBaak, 1987).
Index (IVI =relative frequency + relative density +
Taxonomic survey of the ground cover flora reflects
relative dominance) and species diversity index (H ' =
the dominance of dicotyledonous plants over
pi ln pi; where, pi= ni/N; and ni = abundance of each
monocots (Table 1). A summary of phytosociological
species, N= total abundance of all species) were
data is summarized in (Table-2). The plant community
derived from the primary data separately for each
represents 24 tree species which bearing 13 families in
layer following Misra (1968). Berger and Parker Index
site I. Azadirachta indica belongs to Meliaceae family
(DBP = Nmax / N Where Nmax = is the number of
exhibit the highest density and frequency and
individuals in the most species and N= is the total
Mangifera indica belongs to Anacardiaceae family
number of all individuals in all species) were weighted
bears the highest IVI score deserves special mention
toward the abundance of the commonest species. For
for its luxuriant occurrence in the study area. The
any information-statistics index, the maximum
minimum IVI value was in the order of Butea
diversity of a community is found when all species are
monosperma(5.43), Eucalyptus paniculata(5.57),
equally abundant. Community’s actual diversity is
Terminalia arjuna(5.75), Dalbergia sissoo(6.59),
measured by the formula: Evenness (E) = H / Hmax.
Caesalpinia pulcherima(6.65).
Rank Abundance diagrams visually describe the
Diversity is the index of the ratio between the number
allocation of individuals to species in communities.
of species and the important value of an individual.
We ranked and represented 34 species in that forest
Shannon index value in site I is 2.56. All informationcommunity in a standard rank abundance diagram.
statistics indices are affected by both the number of
species and their equitability or evenness. A higher
number of species and a more even distribution both
III.
RESULTS
increase diversity. The evenness index value is 0.718.
Table 1: Recorded tree species presenting with density and important value index (IVI) from site I in Durgapur
Government College Campus during my study period from March, 2010 to March 2011
Family
Species
TI
D
RD
F (%)
FC
RF
BA
R
IVI
(tree/ha)
(m2·
Do
ha_1)
Anacardiacea
Mangifera indica
6
1.5
14.63
75
D
9.67
8.85
16.8 41.11
e
1
Anacardium occidentale
0
0
0
0
0
0
0
0
0
Apocynaceae
Alstonia scholaris
0
0
0
0
0
0
0
0
0
Holarrhena
0
0
0
0
0
0
0
0
0
antidysentrica
Rutaceae
Aegle marmelos
1
0.25
0.61
25
B
3.22
1.86
3.53
7.35
Meliaceae
Azadirachta indica
10
2.5
6.09
100
E
12.9
8.81
16.7 35.72
0
3
Melia azadirachta
2
0.5
1.21
50
C
6.45
1.87
3.55 11.21
Moraceae
Artocarpus heterophylus
2
0.5
1.21
50
C
6.45
6.17
11.7 19.38
2
Ficus benghalensis
1
0.25
0.61
25
B
3.22
3.75
7.12 10.94
Ficus religiosa
1
0.25
0.61
25
B
3.22
2.82
5.35
9.17
Leguminosae
Caesalpinea pulcherima
1
0.25
0.61
25
B
3.22
1.49
2.83
6.65
Delonix regia
1
0.25
0.61
25
B
3.22
1.82
3.45
7.27
Cassia fistula
3
0.75
1.82
50
C
6.45
2.63
4.99 13.26
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A:F
ratio
0.016
0
0
0
0.008
0.020
0.008
0.008
0.008
0.008
0.008
0.008
0.012

14
15
16
17
18
19
20
21
22
23
24

Dipterocarpac
eae
Anonaceae
Myrtaceae
Verbenaceae
Combretacea
e
Aurocariacea
e
Fabaceae

Albizzia lebbek
Dalbergia sissoo
Tamarindus indica
Acacia nilotica
Shorea robusta

0
1
3
2
2

0
0.25
0.75
0.5
0.5

0
0.61
1.82
1.21
1.21

0
25
75
50
50

0
B
D
C
C

0
3.22
9.67
6.45
6.45

0
1.46
2.49
1.28
2.75

0
2.77
4.73
2.43
5.22

0
6.59
16.22
10.09
12.88

Polyalthia longifolia
Eucalyptus paniculata
Tectona grandis
Terminalia arjuna

2
1
0
1

0.5
0.25
0
0.25

1.21
0.61
0
0.61

50
25
0
25

C
B
0
B

6.45
3.22
0
3.22

1.82
0.89
0
1.02

3.45
1.69
0
1.93

11.11 0.008
5.51 0.008
0
0
5.75 0.008

Aurocaria sp.

0

0

0

0

0

0

0

0

0

0

Butea monosperma

1

0.25

0.61

25

B

3.22

0.85

1.61

5.43

0.008

(TI- Total no. of individuals, D- Density, RD- Relative
Density, F- Frequency, FC- Frequency Class, RFRelative Frequency, BA- Basal Area, R Do- Relative
Dominance, IVI- Important Value Index)
Table 1a: Calculated diversity indices of tree species
from site I in Durgapur Government College Campus
during my study period from March, 2010 to March,
2011
Diversity Indices
Dominance_D
0.1089
Shannon_H
2.56
Evenness_e^H/S
0.7186
Margalef
4.578
In site II among 24 tree species,
Polyalthialongifolia, belongs to Annonaceae family,
exhibit highest density and frequency. The vegetation
of studied areas

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2
3
4
5
6
7
8
9
10
11
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14
15
16
17
18

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showed the presence of evergreen plant species. A
summary of phytosociological data is summarized in
(Table-3). Among all the listed twenty four plant
species Caesalpinea pulcherima belongs to
Leguminosae family was found leading dominant in
most of the stands. The IVI values (Table- 4) revealed
that the highest value belongs to the species
Caesalpinea pulcherima. The decreasing trend of IVI
value was in the order of – Butea monosperma(6.52),
Azadirchta indica(6.60), Aurocaria sp. (6.65),
Anacardium occidentale (6.82). The highest IVI value
of Caesalpinea pulcherima reveals that the species
was most dominant in that community and the lowest
IVI values of Butea monosperma, Azadirchta indica,
Aurocaria sp., Anacardium occidentale represent that
they are the rare species of that community. Higher
Shanon index value in this site is 2.78.

Table 2: Recorded tree species presenting with density and important value index (IVI) from site II in Durgapur
Government College Campus during my study period from March, 2010 to March 2011
Family
Species
T
D
RD
F
FC
RF
BA (m2· R Do
IVI
I (tree/ha
(%)
ha_1)
)
Anacardiaceae
Mangifera indica
1
0.25
2.22
25
B
2.85
1.8
3.00
8.07
Anacardium occidentale 1
0.25
2.22
25
B
2.85
1.05
1.75
6.82
Apocynaceae
Alstonia scholaris
5
1.25
11.1
75
D
8.57
4.66
7.77
27.45
1
Holarhena antidysentrica 3
0.75
6.66
50
C
5.71
1.83
3.05
15.42
Rutaceae
Aegle marmelos
3
0.75
6.66
50
C
5.71
3.42
5.70
18.07
Meliaceae
Azadirachta indica
1
0.25
2.22
25
B
2.85
0.92
1.53
6.60
Melia azadirachta
0
0
0
0
0
0
0
0
0
Moraceae
Artocarpus heterophylus 1
0.25
2.22
25
B
2.85
2.22
3.70
8.77
Ficus benghalensis
2
0.5
4.44
25
B
2.85
5.26
8.78
16.07
Ficus religiosa
1
0.25
2.22
25
B
2.85
2.50
4.17
9.24
Leguminosae
Caesalpinea pulherima 4
1
8.88
75
D
8.57
11.45
22.94 40.39
Delonix regia
2
0.5
4.44
50
C
5.71
2.20
3.62
13.77
Cassia fistula
0
0
0
0
0
0
0
0
0
Albizzia lebbek
1
0.25
2.22
25
B
2.85
1.22
2.03
7.10
Dalbergia sissoo
3
0.75
6.66
75
D
8.75
3.82
6.37
21.60
Tamarindus indica
0
0
0
0
0
0
0
0
0
Acacia nilotica
0
0
0
0
0
0
0
0
0
Dipterocarpace
Shorea robusta
1
0.25
2.22
25
B
2.85
1.55
2.58
7.65
ae
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0
0.008
0.008
0.008
0.008

837 | P a g e

A:F
ratio
0.008
0.008
0.013
0.012
0.012
0.008
0
0.008
0.016
0.008
0.010
0.008
0
0.008
0.008
0
0
0.008

19

Anonaceae


6

1.40

20
21
22
23
24

Myrtaceae
Verbenaceae
Combretaceae
Aurocariaceae
Fabaceae

Tectona grandis
Terminalia arjuna
Aurocaria sp.
Butea monosperma

4
3
1
1
1

1
0.75
0.25
0.25
0.25

from site II in Durgapur Government College Campus
2011
Diversity Indices
Dominance_D
0.07259
Shannon_H
2.788
Evenness_e^H/S
0.8123
Margalef
4.991
Eucalyptus paniculatawas found to be the most
frequent, dominant and important species in the
community in site III. The increasing trend of IVI
value was in the order of – Tamarindus indica (7.49),
Tectona grandis(7.57), Terminalia arjuna (8.24) .The
highest IVI value of Eucalyptus paniculata reveals
that the species was most dominant in that community.
Shannon index value is 2.435. On the other hand the
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3
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5
6
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13.3
100
E
11.4
3
2
2.22
75
D
8.57
6.66
50
C
5.71
2.22
25
B
2.85
2.22
25
B
2.85
2.22
25
B
2.85
evenness index value is 0.7613.

IV.

D
(tree/ha)

RD

F
(%)

FC

RF

Anacardiaceae

Mangifera indica
Anacardium occidentale
Alstonia scholaris
Holarrhena
antidysentrica
Aegle marmelos
Azadirachta indica
Melia azadirachta
Artocarpus heterophylus
Ficus benghalensis
Ficus religiosa
Caesalpinea pulcherima
Delonix regia
Cassia fistula
Albizzia lebbek
Dalbergia sissoo
Tamarindus indica
Acacia nilotica
Shorea robusta

0
0
2
0

0
0
0.5
0

0
0
5
0

0
0
50
0

0
0
C
0

2
5
3
1
0
0
3
1
2
0
2
1
0
2

0.5
1.25
0.75
0.25
0
0
0.75
0.25
0.5
0
0.5
0.25
0
0.5

5
12.5
7.5
2.5
0
0
7.5
2.5
5
0
5
2.5
0
5

50
75
75
25
0
0
75
25
50
0
50
25
0
50

4
10
1
1
0
0

1
2.5
0.25
0.25
0
0

10
25
2.5
2.5
0
0

75
100
25
25
0
0

Leguminosae

Dipterocarpace
ae
Anonaceae
Myrtaceae
Verbenaceae
Tectona grandis
Combretaceae
Terminalia arjuna
Aurocariaceae
Aurocaria sp.
Fabaceae
Butea monosperma
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4.01
3.57
1.25
0.95
0.87

6.69
5.95
2.08
1.58
1.45

17.48
18.32
7.15
6.65
6.52

0.010
0.012
0.008
0.008
0.008

DISCUSSIONS

TI

Moraceae

33.68 0.012

from site II in Durgapur Government College Campus
2011
Diversity Indices
Dominance_D
0.115
Shannon_H
2.435
Evenness_e^H/S
0.7613
Margalef
3.795

Species

Rutaceae
Meliaceae

8.93

Table 3: Recorded tree species presenting with density
and important value index (IVI) from site III in
Durgapur Government College Campus during my
study period from March, 2010 to March 2011

Family

Apocynaceae

5.35

R Do

0
0
6.45
0

BA
(m2·
ha_1)
0
0
1.77
0

IVI

A:F
Ratio

0
0
3.57
0

0
0
0
0
15.02 0.008
0
0

C
D
D
B
0
0
D
B
C
O
C
B
0
C

6.45
9.67
9.67
3.22
0
0
9.67
3.22
6.45
0
6.45
3.22
0
6.45

2.37
4.73
3.45
3.20
0
0
5.94
1.32
1.59
0
2.83
0.88
0
3.52

4.78
9.54
6.95
6.45
0
0
11.98
2.66
3.20
0
5.70
1.77
0
7.10

16.23
31.71
24.12
12.17
0
0
29.15
8.38
14.65
0
17.15
7.49
0
18.55

0.008
0.013
0.008
0.008
0
0
0.008
0.008
0.008
0
0.008
0.008
0
0.008

D
E
B
B
O
0

9.67
12.90
3.22
3.22
0
0

3.79
12.01
0.92
1.25
0
0
838 | P

7.64
24.22
1.85
2.52
0
0
age

27.31
62.12
7.57
8.24
0
0

0.010
0.020
0.008
0.008
0
0

In order to assess ecological knowledge of
the native flora in Durgapur College campus in
general, a quantitative phytosociological study in
different was carried out. Importance Value Index
(I.V.I.) for each plant species was determined to
quantify the importance of each species. The
vegetation of the studied sites is composed of
evergreen vegetation. The disturbance is mainly due to
the extensive cutting of tress for fuel and for fodder,
overgrazing, removal of economically important trees
and some other biotic interference. These activities are
responsible in converting natural vegetation to semi
natural vegetation. An important component of any
ecosystem is the species it contains. Species also
serves as good indicators of the ecological condition
of a system (Morgenthal, et al., 2001). A list of all
species collected during the study was compiled. The
floristic composition of different area was also
compared. The species composition of the three
studied sites was considerably different. Vegetation
analysis gives the information necessary to determine
the name of the community and provide data that can
be used to compare it with other communities. Four to
five plant communities: Azadirachta indica,
Polyalthia longifolia, Eucalyptus paniculata were
observed as a leading dominant. The communities
with strong single species dominance have been
attributed to grazing, species competition, seed
predation, disease, stability and niche diversification
(Whittaker and Levin 1977, Harper 1977). The rarer
plant species with poor representation in our samples
need proper attention from plant biologists to
determine their conservation status and key functions.
Butea
monosperma,
Eucalyptus
paniculata,
Terminalia arjuna, Dalbergia sissoo, Caesalpinia
pulcherima in site I; Butea monosperma, Azadirchta
indica, Aurocaria sp., Anacardium occidentale in site
II and Tamarindus indica, Tectona grandis,
Terminalia arjuna in site III. The communities in the
study area were heterogeneous. The absence of certain
frequencies classes in the communities reflected the
heterogeneity of the vegetation, which is either due to
biotic disturbance or the floral poverty. The result
obtained by Raunkiaer (1934) may be regarded only
as possibilities to be confirmed by other alternative
approaches. The ratio of abundance to frequency for
different species was calculated to elicit the
distributional patterns. This ratio indicates regular
(<0.025), random (0.025-0.05) and contagious (>0.05)
distributions (Curtis and Cottam 1956). In our present
investigation all of the studied plant species were
regular in distribution. The concept of species
diversity relates simply to “richness” of a community
or geographical area in species. At the simplest level
of examination, species diversity corresponds to the
number of species present. Species diversity is
considered to be an important attribute of community
organization and allowed comparison of the structural
characteristics of the communities. It is often related
to community dynamics stability, productivity,
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integration, evolution, structure and competition. The
idea of displacement of one species through
competition with other is net prime importance.
Protection of the natural flora from overgrazing is
necessary, especially during the time when the
desirable plants set their seeds. Protection is essential
to maintain the desirable forage plant species in a
good proportion, to avoid invader plant species and to
rehabilitate the destroyed natural flora (Arshad, et al.,
2002). We must carry out our efforts to make a list of
the plant species, which can be lost from the natural
environment, otherwise it will leads to desertification.
Desertification associated with human activities has
been recognized over the past two decades as one of
the important facets of ongoing global environmental
change (Verstraete and Schwartz, 1991; UNEP,1997;
Huenneke, et al., 2002) and Species loss can alter the
goods and services provided by ecosystems (Hooper,
et al., 2005).
The variable rate of frequency class distribution at
three studied sites of Durgapur Government College
campus may be explained by a common biological
explanation pattern which implies most dominant
species appeared to colonize a new area appropriates a
fraction of the available resources and by competitive
interaction, pre-empts that fraction. The second
species then preempts a similar fraction of the
remaining resource and so on with further colonists.
The reconstruction of plant communities on disturbed
sites with a species composition similar to that of the
natural area will require allocation of more financial
inputs. The saving and establishment of plant
communities one of the major tasks facing by
ecologist. Extensive work on the development of
vegetation depends upon good indigenous vegetation
recovery. Preservation of these communities
especially within disturbed sites is more generally,
demands a unique and pressing conservation
challenge. Extensive cutting of tress for fuel and for
fodder, overgrazing, removal of economically
important trees and some other biotic interference
affecting the nature, structure and composition of
plant communities. Since species diversity is
important to maintain heterogeneity of a stable
ecosystem, the diversity is to be preserved through
appropriate measures. Since this forest is likely to
have generous impact on socio-economic conditions
of local stakeholders, its ecorestoration and protection
is of utmost importance.

REFERENCES
[1]

[2]
[3]

Arshad, M, Salahuddin&Rao, A (2002).
Phytosociological Assessment of natural
reserve of national park Lalsuhanra (Punjab,
Pakistan). Asian Journal of Plant Sciences 1
(2): 174 - 175.
Ashby, W.R. (1974). Einfuhrung in die
kybernetik. Frankfurt/ M. 416.
Chapin III, F.S. &Korner, C. (1995).
Patterns, causes, changes and consequences
839 | P a g e


[4]

[5]

[6]

[7]
[8]

[9]

[10]

[11]

[12]
[13]

[14]

[15]

[16]

[17]

[18]

of biodiversity in arctic and alpine
ecosystems. In Chapin III, F.S. &Kmrner, C.
(Eds.), Arctic and alpine biodiversity:
Patterns, causes and ecosystem consequences
(pp. 313-320). Springer, Berlin.
Cornell, H.V. & Lawton, J.H. (1992). Species
interactions, local and regional processes, and
limits to the richness of ecological
communities: a theoretical perspective. J.
Anim. Ecol., 61, 1-12.
Curtis, J.T. &Cottam, G. (1956). Plant
Ecology Workbook Laboratory Field
Reference Manual. Burgess Publishing Co.
Minnesota 193.
Day, F.P. Jr. & Monk, C.D. (1974).
Vegetation patterns on a southern
Appalachian watershed. Ecology, 55, 10641074.
Harper, J.L. (1977). Population Biology of
Plants. Academic Press, New York.
Hooper, D.U. &Vitousek, P.M. (1997).The
effects of plant composition and diversity on
ecosystem processes. Science, 277, 13021305.
Hooper, et.al. (2005). Effects of biodiversity
on ecosystem functioning: a consensus of
current knowledge, Ecol. Monogr, 75, 3-35.
Host, G. E. &Pregitzer, K. S. (1992).
Geomorphic influences on ground-flora and
over story composition in upland for- Plant
diversity in boreal forest of north-western
Lower Michigan. Canadian Journal of
Forest Research, 22, 1547-1555.
Huenneke, et.al. (2002). Desertification alters
patterns of aboveground net primary
production in Chihuahua ecosystems.
Biology, 8, 247–264.
Huston, M.A. (1994). Biological diversity.
Cambridge University Press, Cambridge.
Kull, K. &Zobel, M. (1991). High species
richness in an Estonian wooded meadow.
Journal of Vegetation Science, 2, 711-714.
Magurran, A.E. (1988). Ecological diversity
and its measurement. Princeton University
Press, Princeton.
Marks, P. L. &Harcombe, P. A. (1981).Forest
vegetation of the Big Thicket, southeast
Texas. Ecological Mono-graphs, 51, 287305.
Misra, R. (1968). Ecology WorkBook.
Oxford and IBH Publishing Company,
Calcutta.
Morgenthal, et.al. (2001). the vegetation of
ash disposal sites at Hendrina Power Station
II: Floristic composition South African
Journal of Botany, 67(4), 520 - 532.
Oechel, et.al. (eds.) (1997). Global change
and arctic terrestrial ecosystems. Springer,
Berlin.

www.ijera.com

[19]

[20]

[21]

[22]

[23]

[24]

[25]

[26]

[27]

[28]

www.ijera.com

Patrick, R. (1997). Biodiversity: Why is it
important? In ReakaKudla, M.L., Wilson,
D.E. & Wilson, E.O. (Eds.), Biodiversity II
(pp.
15-24).
Joseph
Henry
Press,
Washington, DC.
Pollock, M.M., Naiman, R.J. & Hanley, T.A.
(1998).Plant species richness in riparian
wetlands - a test of biodiversity theory.
Ecology, 79, 94-105.
Rannie, W.F. (1986). Summer air
temperature and number of vascular species
in arctic Canada .Arctic, 39, 133-137.
Raunkiaer, C. (1934). The life forms of
plants and statistical. Plant Geography, Being
the collected papers of C. Raunkiaer.
(pp.632) Oxford, Clarendon Press.
Reynolds, H.L. &Tenhunen, J.D. (Eds.)
(1996).Landscape function and disturbance in
Arctic tundra. Springer,
TerBaak, C.J.F. (1987).The analysis of
vegetation environmental relationship by
canonical
correspondence
analysis.
Vegetatio, 69, 69-77.
United Nations Environment Program
(UNEP).
(1997).
World
Atlas
of
Desertification. 2nd ed. Edward Arnold,
London, and Wiley, New York, USA.
Verstraete, M.M.
& Schwartz, S.A.
(1991).Desertification and global change,
Vegetatio, 91, 3-13.
Whittaker, R. H., &Niering, W. A. (1975).
Vegetation of the Santa Catalina mountains,
Arizona.
Whittaker, R.H. & Levin, S.A. (1977). The
role of mosaic phenomena in mosaic
communities.
Theoretical
Population
Biology, 12,117-139.

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